Adopted in 1991 , it stands for a multiplying factor of one part in a million billion billion ( one septillion ) parts , which is often written as 10 .
它在1991年被采用，代表“一千的八次方分之一”的系数，通常写作10。
Adopted in 1991 , it stands for a multiplying factor of one part in a million billion billion ( one septillion ) parts , which is often written as 1024 .
